Caterpillar builds Off-Highway Trucks specifically for work in mines, construction and quarries. Our Off-Highway Trucks are pass-matched with Cat Wheel Loaders and Hydraulic Excavators to speed cycle times and maximize productivity.

Steering

Tires

Approximate Weights – Flat Floor

Body

13550 kg

Power Train - Engine

The twelve-cylinder, turbocharged engine is built for power, reliability, economy and with the HEUI™ fuel system, meets worldwide emissions.

Cat 3412E Diesel Engine

The four-stroke design uses long power strokes for more complete fuel combustion and optimum efficiency. High displacement and a low speed rating can help extend engine life. This engine meets U.S. Environmental Protection Agency Tier 2 emissions regulations and Stage II EU Emissions Directive 97/68/EC.

Torque Rise

The 40 percent torque rise provides high lugging force during acceleration and less down-shifting on grade or in rough underfoot conditions. The torque rise effectively matches the transmission shift points to provide maximum efficiency and faster cycle times.

Dry-type, radial seal air cleaners with primary and secondary elements and precleaner

Direct-electric, 24-volt starting system with 50-amp alternator and two 172-amp-hour, low maintenance, high output, 12-volt batteries

Hydraulic Electronic Unit Injector (HEUI™)

The HEUI is a proven high-pressure, direct injection fuel system. This system electronically monitors operator and machine inputs to optimize engine performance. HEUI is unique in its ability to independently control injection pressure over the entire engine operating range. This allows complete control over injection timing, duration, performance and efficiency. Rate shaping technology modifies the heat release characteristics of the combustion process for significant decreases in sound and emission levels. Exhaust smoke is significantly reduced through precise, electronic control of fueling limits and injection timing.

Electronic Control Module (ECM)

The ECM monitors key functions and logs critical indicators. The Electronic Technician can access this diagnostic information for easier maintenance and repair.

Power Train - Transmission

The Cat seven-speed, power shift transmission gets the job done smoothly and quickly.

Transmission

The Cat seven-speed, power shift transmission, matched with the direct-injection 3412E diesel engine provides constant power over a wide range of operating speeds.

Transmission Features

Include:

Seven speeds forward, one reverse

Torque converter driven in reverse

First gear has both torque converter drive and direct drive

Second through seventh gears are direct drive

Single-lever shift control provides automatic shifting in all gears up to the one selected by the control lever

Each shift is individually modulated for maximum smoothness

Separate hydraulic circuit with cooler

Electronic control has built-in diagnostics and fault memory, event memory and programmable features

Control throttle shifting

Economy shift mode

1) Lock-up Torque Converter

Combines the maximum rimpull and cushioned shifting of torque converter drive with the efficiency and performance of direct drive.

Engages at approximately 6.9 km/h (4.3 mph), delivering more power to the wheels

• Elevated Idle Neutral Coast Inhibitor

• Body-up Shift Inhibitor

Helps prevent the transmission from shifting above a pre-programmed gear without the body fully lowered.

• Event Memory

Records machine management data that can be accessed using the Electronic Technician. Recorded information includes:

Shift histograms

Operator-induced events

Lock-up clutch counter

Machine overspeed

Transmission overspeed

Electronic Technician (ET)

The electronic engine and transmission controls provide exhaustive diagnostic capability for service technicians. The ability to store both active and intermittent indicators will simplify problem diagnosis and reduce total repair time, resulting in improved mechanical availability and lower operating cost.

Oil-Cooled Disc Brakes

Are designed and built for reliable, adjustment-free operation providing superior performance and service life in comparison to shoe-type and dry-disc systems.

Oil Film

An oil film prevents direct contact between the discs. Absorbing the braking forces by shearing oil and carrying heat away, this design extends brake life.

Secondary Braking

Spring-applied, hydraulically released, oil-cooled disc brakes are located on the rear axle. The front brakes will activate as part of the secondary system, even if switched out of service.

Parking Brakes

Spring-applied, hydraulically released parking brakes use wet disc brakes in the service system. A toggle switch activates the parking brake.

Pistons

A Caterpillar patented, two-piston design combines the service, secondary and parking brakes, along with retarding functions.The primary piston hydraulically actuates both service and retarding functions. The secondary piston is spring-applied and held in the disengaged position by hydraulic pressure. If hydraulic system pressure drops below a certain level, the spring-applied secondary piston automatically applies the brakes.

Integrated Braking Control (IBC)

Electronically combines Automatic Retarding Control (ARC) and the Traction Control System (TCS) into one integrated control system.

Automatic Retarder Control (Optional)

The ARC electronically controls braking on grade to maintain approximately 2,230 rpm (engine rpm is adjustable from 2,150-2,300 rpm in increments of 10 rpm). ARC is deactivated when the operator applies the brakes or throttle.

Engine Overspeed Protection

With the accelerator depressed and/or ARC turned off, ARC will automatically activate at 2,475 rpm to help avoid potentially destructive and often costly engine overspeeds.

Traction Control System (Optional)

Monitors wheel slip so if it exceeds the set limit, the oil-cooled disc brakes are automatically applied to slow the spinning wheel.

Operator Awareness

An on-dash indicator shows the operator that TCS is engaged.

Differential Action

Utilizes normal differential action to provide superior maneuvering in poor underfoot conditions. Also reduces tire scuffing as compared to positive lock differentials used on other systems.

Torque

TCS divides torque equally to reduce stress created on final drives and axles when torque is transferred to one side.

System Back-up

Should sensors fail, the normal differential action is still available to maintain control and steering.

Structures

The backbone of the Cat off-highway truck.

Box-Section Design

The 773E frame uses a box-section design, incorporating 20 castings in high stress areas with deep penetrating and continuous wrap-around welding. Mild steel, which provides flexibility, durability and resistance to impact loads even in cold climates is used throughout.

Castings

Castings have large radii with internal reinforcing ribs to dissipate stress. Castings move welds to lower stress areas and provide two to three times the strength of equivalent sized fabricated structures.

Frame Features

Include:

Integral front bumper

Front box beams for suspension cylinder and ROPS support

Box-section rear crossmember for body and ROPS support with attachment points for maintenance platform and rear engine hood hinge support

Frame Serviceability

The box-section frame allows simple access to power train components. This open design reduces overall removal and installation time, lowering repair costs. Transmission access is excellent under the raised and pinned body. Repairs can be made without preheating in ambient temperatures above 16° C (60° F) using readily available welding supplies.

Serviceability/Total Customer Support

Cat QuickEvac™ System

Automated Engine Oil Change

A new, state-of-the-art, on-board system evacuates engine sump in less than two minutes and allows for purge of oil filters prior to removal, minimizing oil spills. It delivers new oil through primary filters for filtered protection and ensures new filters are correctly filled following routine oil change.

Contamination Control

Environmentally efficient, clean oil changes are ensured since engine sump is evacuated directly into PM trucks or waste containers with flush faced, quick disconnects for fast evacuation and fill. This eliminates handling of waste oil, minimizes chances of oil spillage and enhances Contamination Control efforts by ensuring complete filtration of new oil on engine refill.

Improved Serviceability and Machine Availability

Reduces time to complete engine service (changing engine oil, oil filters, fuel filter, air cleaner) by as much as 30 to 50 percent. Improves the ability to schedule engine services at prescribed hours, allows for servicing during normal working hours and integrates easily with PM trucks to further reduce total cycle time of engine service.

System Approach

The Caterpillar system approach means increased efficiencies through common design. Haul trucks, loaders, excavators, tractors, engines for generator sets and pumps - all designed by Caterpillar - use common components, parts and design. Commonality reduces customer parts stock, improves parts availability, reduces training/maintenance and improves diagnostics. This system approach adds up to lower costs-per-ton. Dealer support is available to address customer needs regardless of the component.